ci: skip npm publish if version already exists

Prevents CI failure when version was already published locally.

Author: 1bcMax

.github/workflows/publish.yml

@@ -26,6 +26,20 @@ jobs:
       - name: Verify package
         run: npm pack --dry-run
 
-      - run: npm publish --provenance --access public
+      - name: Check if version already published
+        id: check
+        run: |
+          PKG_NAME=$(node -p "require('./package.json').name")
+          PKG_VERSION=$(node -p "require('./package.json').version")
+          if npm view "${PKG_NAME}@${PKG_VERSION}" version 2>/dev/null; then
+            echo "already_published=true" >> "$GITHUB_OUTPUT"
+            echo "⚠️ ${PKG_NAME}@${PKG_VERSION} already published, skipping"
+          else
+            echo "already_published=false" >> "$GITHUB_OUTPUT"
+          fi
+
+      - name: Publish to npm
+        if: steps.check.outputs.already_published != 'true'
+        run: npm publish --provenance --access public
         env:
           NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}